Authors: Caudillo-Flores, U; Munoz-Batista, MJ; Kubacka, A; Fernandez-Garcia, M

Article; Proceedings Paper.
Mol. Catal.. vol: 481. page: 2468-8231.
Date: FEB. 2020.
Doi: 10.1016/j.mcat.2018.11.011.

The performance of binary PtPd co-catalysts supported on Nb-TiO2 was tested in the gas and liquid phase photoreforming of methanol. Co-catalyst formulations having Pt:Pd ratios from 2:1 to 1:4 were tested and the activity measured through the calculation of the quantum efficiency. Characterization of the initial and post-reaction materials showed that optimum activity is achieved in both processes by samples containing binary co-catalysts where Pd suffers an oxidation process and a PtPd alloying metallic phase is formed under reaction conditions. The analysis of catalytic output through an experimental design considering tree factors (methanol:water ratio, irradiance level, and catalyst volumetric concentration at liquid phase or surface concentration at gas phase) shows that the liquid phase process presents a rather high quantum efficiency value compared with the gas phase but the latter process displays higher atom efficiency as well as renders products with lower toxicity..